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 *   Copyright (c) 2022 Huawei Device Co., Ltd.
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import JapaneseContextAnalysis from './JapaneseContextAnalysis';
import {Order}                 from './JapaneseContextAnalysis';

class SJISContextAnalysis extends JapaneseContextAnalysis {
  ////////////////////////////////////////////////////////////////
  // constants
  ////////////////////////////////////////////////////////////////
  public static HIRAGANA_HIGHBYTE:number = 0x82;
  public static HIRAGANA_LOWBYTE_BEGIN:number = 0x9F;
  public static HIRAGANA_LOWBYTE_END:number = 0xF1;
  public static HIGHBYTE_BEGIN_1:number = 0x81;
  public static HIGHBYTE_END_1:number = 0x9F;
  public static HIGHBYTE_BEGIN_2:number = 0xE0;
  public static HIGHBYTE_END_2:number = 0xEF;

  ////////////////////////////////////////////////////////////////
  // methods
  ////////////////////////////////////////////////////////////////
  public constructor() {
    super();
  }

  protected getOrder(order:Order, buf:ArrayBuffer, offset:number):void {
    order.order = -1;
    order.charLength = 1;

    let tempIntArray = new Int8Array(buf);
    let highbyte:number = tempIntArray[offset] & 0xFF;
    if ((highbyte >= SJISContextAnalysis.HIGHBYTE_BEGIN_1
        && highbyte <= SJISContextAnalysis.HIGHBYTE_END_1)
        || (highbyte >= SJISContextAnalysis.HIGHBYTE_BEGIN_2
        && highbyte <= SJISContextAnalysis.HIGHBYTE_END_2)) {
      order.charLength = 2;
    }

    if (highbyte == SJISContextAnalysis.HIRAGANA_HIGHBYTE) {
      let lowbyte:number = tempIntArray[offset+1] & 0xFF;
      if (lowbyte >= SJISContextAnalysis.HIRAGANA_LOWBYTE_BEGIN
          && lowbyte <= SJISContextAnalysis.HIRAGANA_LOWBYTE_END) {
        order.order = (lowbyte - SJISContextAnalysis.HIRAGANA_LOWBYTE_BEGIN);
      }
    }
  }

  public getOrderReturn(buf:ArrayBuffer, offset:number):number {
    let tempIntArray = new Int8Array(buf);
    let highbyte:number = tempIntArray[offset] & 0xFF;
    if (highbyte == SJISContextAnalysis.HIRAGANA_HIGHBYTE) {
      let lowbyte:number = tempIntArray[offset+1] & 0xFF;
      if (lowbyte >= SJISContextAnalysis.HIRAGANA_LOWBYTE_BEGIN
          && lowbyte <= SJISContextAnalysis.HIRAGANA_LOWBYTE_END) {
        return (lowbyte - SJISContextAnalysis.HIRAGANA_LOWBYTE_BEGIN);
      }
    }

    return -1;
  }
}

export default SJISContextAnalysis;